Device for operating on flat articles



April 7, 1931- c. K. sTRoBEI. 1,799,655

DEVICE FOR OPERATING oN FLAT 'ARTICLES Filed March 2o, 195o l l I 1 :I Il

- Ellll f o'lll/lll/l/llllllllllllll//l//J [g INVENTOR 2 Patented pr.' 7, 1931 maar, j

buiten' stares emana carica CHARLES n, sfrnonniioii rrrfrsnnnerr, rniiiisirivnivie, essie-Non 'ro Tian iiNioN sii/"iron a sis-NAL ooMrANY., or swissvALn, rnNNsYiivANii-i, A 'conronAaroN or PENNSYLVANIA *Applicationeiea Marcil. ze,

device embodying my invention' with` the parts in the positions;A which they occupy when the device is operating on an article.

IligfQ is atop plan view of an article-which has been operated on by the device illustrated in Fig. l. Y

Similar reference characters refer to similar parts in both views.,

` Devices 'embodying myinvention are particularly suitable for, lalthough in no way limited to, use in the manufacture of electri- 1 cal rectifiersof theftype disclosed and lclaimed in Letters lPatent kof Athe United States, No. y1,640,335, vgranted to Lars O.

l Grondahlon August Q3, 1927. In at least one form of rectifier of this type, rectifying elements consisting` of metallic blanks, such as perforated disks or washersof kcopper or iron yare treated to forma coating of a ccmpound of the metal, suchas an oxide or iodide, on one side thereof. After the'blanks have been thustreated, it is desirable to rub finely divided low resistance electrical con-` ducting material, such as powdered petroleum coke, into the coated surface lof the blanks. Thisoperation is usually performed by placing the blanks with the kcoated side up on a piece of suitable gripping material, such as emery cloth, and applying a vrotating member, provided with. a friction ring of suitable material, to the coated surface after the coated surface has been sprinkled with the powdered material which it is desired to rub into this surface. During this operation, it is important that none ofthe powdered material be rubbed into the blanks adjacent the edges of the oxidized surface where it might be undesirable 'during subsequent stages in the preparation of the lcompleted rectifier, and it istherefore desirable that a:

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Vnarrow ring vof the surfaceof-'the blanks ad-Y jacent each edge should not be rubbed It.'

4blanksta'rts spinning Awhen the friction ring isbrought into engagement with;this surface, and as arresult, the powdered material is applied to more than thefd'esired-portion V.of the surface of the blank.r Thepurpo'se-of vthe present invention is `primarily to provide ai device for rubbing thepowdered ymaterial into' thedesired portion of the surfaceof the p blanks in such manner that thebl'anks cannot spin during this operation,l thereby eliminatingspoilage of blanks in manufacture and providing a superior product. It is to be understood, however, that devices embodyi ing my invention, and one. form of which I will nowfdescribe, are not limited to thisuse but are suitable for operating on the surface of'ai'iy kind of a flaty article sults are to lbe attained'. f

Referring `nowto the drawing, one form of devicelembodying my invention'cornprises a tapered shank 3 which is adaptedffor1 insertion in any suitablefmachineuby `i"neansof when similar rewhich ythe device may be both rotated and reciprocated, such 'for example, as anyofthe welljknown forms of drill pressesi'iv; :Secured byineans of'screws 2.to a vcircular flange 3 formed on vthe lower end ofthe shankB Ais a cylindrical member l, the upper andl lower ends of'which are provided, .respectively,A Awith two axially disposed'cylindrical openings l and 5, which openings are separated from'each other by apartition 6.l A. bolt 7 v extends with considerable clearance through anl opening 6a vin the partitioni@ and is fasf tened by kmeans of a nut 7L to two cones 8 andf9 which are located on opposite sides of the partition 6in the openings .4s and '5,y respectively,and which are. adapted to rotate 'freely with respect to the memberfl on ball bearings 10. Attached' to' the lower endl of the bolt 7, and fitting freely inthe cylindrical opening 5, is a hollow cylindrical member 11.

:A plunger 'l2 extends with some vclearance into the lower end of the cylindrical member l1', and is attached at its upper end to oneend of a compression spring'l, the other end of which is secured to the member 11. The

lower end of the plunger 12 carries a gripping member 14 of suitable material such as libre, rubber, micarta, etc., which will not injure the coating of a rectier blank when the gripping member is forced into engagement with the surface of the blank by the spring 13 as will be explained more fully hereinafter. A ring 15 of suitable material, such as wood, is fastened to the lower end of the member 1 in any suitable manner, as by screws 16, and glued or otherwise secured to this ring is a. friction ring 17 of rubber or other suitable material.

The parts are so proportioned that when the device is not engaging the surface of an Yeo article the lunoer 12 is forced downwardli a P s Vby the spring 13 to a point where the gripping member 14 extends below the lower side of the friction ring 17. It will be apparent,

therefore, that when therotating device is moved into engagement with an article whose surface is to be rubbed, such for example, as the rectifier blank 18 shown in the drawing, the gripping member 14 comes into contact with the surface of the vblank before the friction ring 17, thereby forcing plunger 12 upwardly and compressing spring 13. Since the cylindrical member 11 which supports the plungerlQ is free to rotate with respect to the member 1, it follows that when the friction ring 17 is rubbing the surface of a blank, the gripping member 14 remains stationary and applies pressure to the blank, thereby holding the blank firmly against its supporting plate 19 during the rubbing `operation and hence preventing the blank from spinning.

-As pointed out hereinbefore, itis important that anarrow ring adjacent each edge of the blank should not be rubbed. In Fig. 2, the shaded area 18a indicates approximately the area that should be rubbed. It will be apparent that by making the friction ring 17 the proper size to engage this area of the blank only the desired area will be rubbed Although I have herein shown and de'- scribed only one form of device embodying my invention, it is understood that various changes and modifications may be made therein within the .scope of Ythe appended claim Without departing from the spirit and Scgpe of my invention.V

aving thus described my invention, what I claim is:

A device for rubbing the surface of a disk, comprising a rotatable shank, a first cylindrical member secured to said shank and provided in its upper and lower ends respectivelyV with two cylindrical axially disposed openings separated by a partition having a hole extending therethrough, two cones located in saidopenings 'on oppositek sides'of said partition and adapted to rotate freely on ball bearings, a bolt extending through the hole in said partition with clearance and secured to said cones, a second hollow cylindrical member fitting freely in the lower one of said openings and secured to said bolt, a compression spring in said second cylindrical member secured at one end to said second cylindrical member, a plunger extending into said second cylindrical member and secured at its upper end to the free end of said spring, a gripping member secured to the lower end of said plunger, and a friction ring` secured to said first member, the parts being so proportioned that if said device is moved into engagement with said disk said gripping member will engage said disk and compress said spring before said friction ring engages said disk for preventing said' disk from spinning while said friction ring is engaging said disk.

Intestimony whereof I aiiix Vmy signature.

' CHARLES K. STROBEL. 

